<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.6.10/dist/vue.js"></script>
</head>

<body>
    <div id="app">
        <p>搜索：<input type="text" v-model="goodsInfo.search"/></p>
    </div>
    <script>
        Vue.config.productionTip = false;
        
        const vm = new Vue({
            el: "#app",
            data() {
                return {
                    goodsInfo:{
                        search:"oppo",
                        price:1999,
                        num:20,
                    }
                }
            },
            watch:{
                goodsInfo:{
                    immediate:true,
                    deep:true,
                    handler(newVal,oldVal){
                        console.log("goodsInfo中有内容改变了",newVal,oldVal);
                        
                    }
                }
            }
        })
</script>
</body>

</html>